Grinder



May 20, 19:30. E, H, FRI KEY 1,759,448

GRINDER Filed Oct. 21, 1927 2 Sheets-Sheet l y 1930- E. H. FRICKEY1,759,448

' I GRINDER Filed Oct. 21, 1927 2 Sheets-Sheet 2 ra -z. fi/ 53 15Patented May 20, 1930 UNITED- STATES PATENT OFFICE EDWARD H. FRICKEY, OFSI. LOUIS, MISSOURI, ASSIGNOR TO DIXIE MACHINERY MANUFACTURING COMPANY,OF ST. LOUIS, MISSOURI, A CORPORATION OF HIS- SOURI GRINDER Applicationvfiled October 21, 1927. Serial No. 227,715;

7 This yinvention relates to grinders, and with regard to certain morespecific features, to grinders for screenings andlike granularmaterials, including grain.

Among the several ob ects of the invent on mav be noted the provisionofa gr1nder 1ncluding the novel combination of a feeding conveyor anddraftapparatus for mainta ning maximum capacity or passage of materialthrough the machine, and the provision of the device of the classdescribed having more 11111- Versal means for accomplishing the adustment and replacement of certa n screen portions. Other objects willbe in part obv ous 1 and in part pointed out hereinafter,

The invention accordingly comprises the elements and combination ofelements, features of construction, and arrangement of parts which willbe exempllfied in the structure hereinafter described, and the scope ofthe application of which will be indicated in the following claims.

In the accompanying drawings, in which is illustrated one of variouspossible embodiments of the invention,

Fig. 1 is a longitudinal section of the apparatus, certain portionsbeing shown in full;

Fig. 2 is a lateral section through the grinding and conveyor elementsof the device, taken substantially on line 2- 2 of Fig. 1; and,

Fig. 3 is a cross section taken on line 33 of Fig. 1. v y

Corresponding reference characters 1ndicate corresponding partsthroughout the several views of the drawings.

Referring now more particularly to Fig. 1, there is illustrated atnumeral 1 a supporting frame for the various elements of the apparatus.Said elements comprise a driv ng motor 3, a grinder 5 proper, pedestalbearings 7 for supporting a rotor 11 of said grinder 5, and preferably acentrifugal suction blower 9.

A main shaft 13, borne in the bearings 7, serves to support the rotor 11of the grinder and the fan blades 15 of the centrifugal blower 9; andhence said rotor and said blades have the same angular velocity. Theshaft 13 is coupled to the motor 3 by means of a $1111); able springcoupling 17.

The grinder proper comprises a casing 19, including a removable cover 21held by fasteners 23,. through which casing 19 passes said shaft 13. Theside walls of the casing are provided with suitable peripheralcorrugated members 25 for cooperation with certain beaters, to bedescribed. On the inside of said cover 21 are also mounted corrugatedplates 27 for operative cooperation with said heaters.

The rotor 11 is keyedror otherwise held, to the shaft 13 within thecasing 19 and comprises suitable spacers 29 for spacing supporting ringsor wheels 31. Near the-peripheral edges of said rings 31 are providedmeans for oscillably mounting a plurality of crushers or heaters 33, thepurpose of which beaters is to forcibly thrust the grain or the likeagainst said'corrugated members 25, 27. The heaters and corrugatedmembers do not come into actual contact but exert a crushing andgrinding action on the grain therebetween.

Below the rotating beater elements and within the casing 19 is provideda curved or substantially semi-circular screen35, adapted to permitpassage of material which. has been reduced to a proper degree offineness, but adapted to retain coarser material and permit it to beagain forced around, either partially or completely by the heaters, foranother passage over the plates 25 and /or 27.

a The support for the screen is novel per so, as well as in combination,and comprises a pair of grids 37, 38 hinged together at a downward point39.- One of the grids, namely grid 38, is hinged within the casing 19 ata point 41 just outside the peripheries of said annular plates 25 andnear the horizontal center line XX of the rotor 11. The grids havecurved or arcuate shapes adapted to fit the screen 35, which is alsoarcuately shaped to fit the periphery of'the plates 25. Also, the widthof the grids 37, 38 are such as to permit them to hold the screen inclamped position against the peripheries of the plate 25 whe)n the gridsare in a raised position (see Fig. 1

.Tlie grids 37, 38 are held in a raised position by means of a link 43pivoted to the upper end of the grid 37 at 45, said 1ink,43 being l alsopivoted at 4 9 to a slide link 47. The slide link 47 is slidable in asleeve 51 and is isigade adjustable by means of a threaded nut It isevident that upon threading down the nut 53, that the slider 47 is drawnup to-pull up the grids 37, 38 against the screen 35 to hold said screenin clamped position against the lower peripheries of the plates 25 (seesolid lines, Fig. 2).

Upon upwardly threading the nut 53, the slider 47 drops and permits thegrids 37, 38 to drop to the dotted line positions shown in Fig. 2. Across pin 55 is provided to be engaged by the grid 38 at a predeterminedposition of said grid, whereupon'the other grid 37 hinges on the grid 38at the hinge 39. At the same time the swinging link 43 permits themovement required by this secondary hinging action, whereby ample roomis provided for removing the screen 35 through the opening 57 left afterremoving a small closure plate 59.

Heretofore grids of this type have been hinged at only one point, suchas point 41 and no compensating links have been provided such as link43. With the present improvement, it is possible to obtain on machinesof much larger size a larger space for removal of the screen.Previously, the merely tangential movement of the swin ing end of thesingle grid has necessitated a much greater grid movement for a givenopening. Here the unhinged end of the grid 37 has a radial component ofmovement which provides a larger and more effective opening for screenremoval with a given grid movement. v

Grain or the like is supplied to the .rotor and easing by means of aninlet passage 61 equipped with screw conveyor 63. The conveyor 63 is diven at a reduced speed from the main shaft 13 by means of a belt andpulley combination 65, geared speed reducer 67, belt and pulleycombination 69 and a pair of mitre gears 71. Speed reduction is such asto provide a suitable ratio between the speed of operation of thegrinding elements and that of the conveyor, so that approximately asmuch material is supplied to the machine as can be ground and sentthrough the screen In order to effect faster passage of small particlesthrough the screen 35, there is provided the suction blower 9 whichinduces a draft in a pipe 73 connecting the inlet of said blower withthe region directly below the screen 35. Air is caused to be drawnthrough the casing 19 and the elements of the rotor 11 by providingopenings 75 in the sides of the casing. These openings are provided withmovable and adjustable plates 77, whereby the amount of air drawn in maybe controlled.

Heretofore, in machines of this class, no au tomatic, direct andpositive inlet conveying system has been used so that its rate of feeddepends upon the rate of operation of the machine. It is evident thatordinarily it would be exceedingly difficult to build a machine inwhich'the ratio of feed to output would be, properly equalized for allclasses of material. With the present invention the control forefl'ecting the proper ratio is exceedingly simple and, taken incombination with the conveyor itself, provides means for obtainingincreased output.

A second damper control 7 9 is provided in the pipe 73 for cutting offany action of the blower 9. The effects of the control 7 9 and thecontrols 77 are entirely different. The former, when closed, preventsthe blower from reducing the pressure within the casing 19, while thelatter, when closed permits said blower to reduce said pressure.

In view of the above, it will be seen that the several objects of theinvention are achieved and other advantageous results attained.

As many changes could be made in carrying out the above constructionswithout departing from the scope of the invention, it is intended thatall matter contained in the above description or shown in theaccompanying drawings shall be interpreted as illustrative and not in alimiting sense.

I claim:

1. In a grinder, a separately removable and flexible screen, means forsupporting said screen comprising a plurality of hinged members, one ofwhich is hinged on the grinder and an adjustable support for the otherhinged member, said support having means for permitting movement of saidother hinged member about a center other than said hinge on the grinderand means for predetermining the movement of the member hinged to thegrinder independently of said other hinged member, whereby space may beattained permitting removal of said screen.

2. A grinder comprising a casing, grind-- ing elements including a rotorand peripherally formed elements cooperating therewith, a screen adaptedto fit the periphery of said elements and a plurality of hinged membersadapted to clamp the screen against said periphery, one of whichelements is hinged with respect to the casing and another one of whichelements is hinged with respect to said element which is hlnged withrespect to the casing, said screen comprising a separate, flexible andremovable element adapted to be withdrawn from the grinder withoutdismantling either the grinderor the screen.

3. A grinder comprising a casing, grinding elements including a rotorand eripherally formed elements cooperating therewith, a screen adaptedto fit the periphery of said elements and a plurality of hinged membersadapted to clamp the screen-against said periphery, one of whichelements is hinged with respect to the casing and another one of whichelements is hinged with respect to said element which is hinged withrespect to the casing and means for adjusting said hinged elementswhereby they may have movement relative to said casing and relative toone another, said screen comprising a separate,

flexible and removable element adapted to be withdrawn from the grinderwithout dismantling either the grinder or the screen.

4. A grinder comprising a casing, grinding elements including a rotorandperipherally formed elements cooperating therewith, a screen adapted tofit the periphery of said elements and a plurality of hinged membersadapted to clamp the screen againstsa'id periphery, one of whichelements is hinged with respect to the casing and another one of whichelements is hinged with respect to said 'element which is hinged withrespect to the casing, means for adjusting said hinged elements wherebythey may have movement relative to said casing and relative to oneanother and means for limiting the movement of the element which ishinged with respect to the casing, said screen comprising a separate,flexible and removable element adapted to be withdrawn from the grinderwithout dismantling either the grinder or the screen.

In testimony whereof, I have signed my name to this specification this19th day of.

October, 1927.

EDWARD H. FRICKEY.

